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This paper presents the fully differential cross sections (FDCS) for
102eV electron impact single ionization of helium for both the
coplanar and perpendicular plane asymmetric geometries within the
framework of dynamically screened three-Coulomb-wave theory.
Comparisons are made with the experimental data and those of the
three-Coulomb wave function model and second-order distorted-wave
Born method. The angular distribution and relative heights of the
present FDCS is found to be in very good agreement with the
experimental data in the perpendicular plane geometry. It is shown
that dynamical screening effects are significant in this geometry.
Three-body coupling is expected to be weak in the coplanar geometry,
although the precise absolute value of the cross section is still
sensitive to the interaction details. 相似文献
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